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O-Polysaccharides (O-antigens) were isolated from Escherichia coli O13, O129, and O135 and studied by chemical analyses along with 2D 1 H and 13 C NMR spectroscopy. They were found to possess a common →2)-l-Rha-(α1→2)-l-Rha-(α1→3)-l-Rha-(α1→3)-d-GlcNAc-(β1→ backbone, which is a characteristic structural motif of the O-polysaccharides of Shigella flexneri types 1–5. In both the bacterial...
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